What are the failures of SF6 ring main unit?

SF6 ring main unit is a compact, enclosed and sealed type of switchgear used for medium voltage power distribution. SF6 ring main unit is a complete switchgear in itself, which means that assembly of required switching devices, protection device and metering device.

What are the failures of SF6 ring main unit?

How to check SF6 ring main unit?

How to maintain SF6 ring main unit?

What are the failures of SF6 ring main unit?

PT or CT fails. SF6 ring main unit with distribution network automation interfaces is often equipped with PT and CT to provide data information such as switch operation power and load current required for distribution network automation. The poor quality of PT and CT provided by the manufacturer is the main cause.

Lightning arrester fails. Some lightning arresters in the SF6 ring main unit break down and explode, causing a short circuit between the cables in the room or the cable head discharges to the shell.

The operating mechanism fails. As the SF6 ring main unit in humid areas is not operated for a long time, the mechanism springs and auxiliary contacts of the control circuit switch are prone to rust.

Cable lap fails. Because the quality of the cable head itself and the construction technology are not good enough, especially when the large cross-section cable gradually releases the stress after installation.

How to check SF6 ring main unit?

Check whether the grounding of the SF6 ring main unit is loose. If found, it should be tightened in time to prevent SF6 ring main unit from being damaged by overcurrent.

Check whether there is dust or other foreign matter on the surface of the SF6 ring main unit. Clean to avoid a large amount of dust accumulation, which will affect the performance.

Check whether the insulation part of the SF6 ring main unit is invalid and the pressure of the insulating gas is normal.

Pay attention to the contact reliability of the circuit. It is necessary to check the high-voltage cables of the SF6 ring main unit that whether the cables are damaged, aging or discharged.

Check whether the operating mechanism of the SF6 ring main unit is flexible, damaged or rusted.

Check the real-time display of the SF6 ring main unit and whether the instrument is normal.

Check whether the outer cabinet of the SF6 ring main unit is cracked, deformed, or abraded.

How to maintain SF6 ring main unit?

The regular maintenance for SF6 ring main unit takes each quarter as the maintenance cycle. The specific content is mainly the adjustment of its operating conditions and the elimination of waste materials, which belongs to the routine inspection and maintenance work objectives.

Improving the conditional maintenance of the SF6 ring main unit is based on the extensive synchronization control and inspection of the operating conditions. It is aimed at reducing the maintenance of the power supply. It can ensure the safety factor of all high-voltage switchgear, improving the overall reliability and safety factor.

The maintenance cycle of SF6 ring main unit is longer with more specific content. Generally, the period is 1 to 2 years. The specific content is to dissolve the SF6 ring main unit extensively and do a good job of large-scale maintenance, especially for the cabinets.

Learn more about SF6 ring main unit can know the failures of SF6 ring main unit and how to maintain SF6 ring main unit. Rockwill T&D Group has a long history of manufacturing SF6 ring main unit. Whether from the price or the delivery time, we can provide you with a better experience.